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Fencer Intel
high 8.2

CVE-2018-16557 json

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATI…

published 7y ago modified 4mo ago also EUVD-2018-8364

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

A vulnerability has been identified in SIMATIC S7-400 CPU 412-1 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-2 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 DP V7 (All versions), SIMATIC S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 414F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416-2 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 DP V7 (All versions), SIMATIC S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 416F-2 DP V7 (All versions), SIMATIC S7-400 CPU 416F-3 PN/DP V7 (All versions < V7.0.3), SIMATIC S7-400 CPU 417-4 DP V7 (All versions), SIMATIC S7-400 CPU 412-2 PN V7 (All versions < V7.0.3), SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) (All versions < V6.0.9), SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants) (All versions), SIMATIC S7-410 CPU family (incl. SIPLUS variants) (All versions < V8.2.1), SIPLUS S7-400 CPU 414-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 PN/DP V7 (All versions < V7.0.3), SIPLUS S7-400 CPU 416-3 V7 (All versions), SIPLUS S7-400 CPU 417-4 V7 (All versions). Sending of specially crafted packets to port 102/tcp via Ethernet interface via PROFIBUS or Multi Point Interfaces (MPI) could cause a denial of service condition on affected devices. Flashing with a firmware image may be required to recover the CPU.

Successful exploitation requires an attacker to have network access to port 102/tcp via Ethernet interface or to be able to send messages via PROFIBUS or Multi Point Interfaces (MPI) to the device. No user interaction is required. If no access protection is configured, no privileges are required to exploit the security vulnerability. The vulnerability could allow causing a denial of service condition of the core functionality of the CPU, compromising the availability of the system.

Patch / fix

  • siemens simatic_s7-410_firmware 8.2.1
  • siemens simatic_s7-400h_firmware 6.0.9

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-18-317-02 updated cvss 8.2

Siemens S7-400 CPUs (Update B)

  • Siemens SIMATIC S7-400 CPU 412-1 DP V7 (6ES7412-1XJ07-0AB0) Siemens SIMATIC S7-400 CPU 412-2 DP V7 (6ES7412-2XK07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 412-2 PN V7 (6ES7412-2EK07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 414-2 DP V7 (6ES7414-2XL07-0AB0) Siemens SIMATIC S7-400 CPU 414-3 DP V7 (6ES7414-3XM07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7 (6ES7414-3EM07-0AB0) < V7.0.3 Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7 (6ES7414-3FM07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 416-2 DP V7 (6ES7416-2XP07-0AB0) Siemens SIMATIC S7-400 CPU 416-3 DP V7 (6ES7416-3XS07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7 (6ES7416-3ES07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 CPU 416F-2 DP V7 (6ES7416-2FP07-0AB0)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7 (6ES7416-3FS07-0AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
show 6 more
  • Siemens SIMATIC S7-400 CPU 417-4 DP V7 (6ES7417-4XT07-0AB0) Siemens SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants) < V6.0.9
    affected: fixed in V6.0.9, mitigation support.industry.siemens.com
  • Siemens SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants)
    affected: mitigation, no fix planned
  • Siemens SIMATIC S7-410 CPU family (incl. SIPLUS variants) < V8.2.1
    affected: fixed in V8.2.1, mitigation support.industry.siemens.com
  • Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7 (6AG1414-3EM07-7AB0) < V7.0.3 Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7 (6AG1416-3ES07-7AB0) < V7.0.3
    affected: fixed in V7.0.3, mitigation support.industry.siemens.com
  • Siemens SIPLUS S7-400 CPU 416-3 V7 (6AG1416-3XS07-7AB0) Siemens SIPLUS S7-400 CPU 417-4 V7 (6AG1417-4XT07-7AB0)
    affected: mitigation, no fix planned

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H/E:P/RL:O/RC:C
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Affected products

  • Siemens SIMATIC S7-400 CPU 412-1 DP V7
  • Siemens SIMATIC S7-400 CPU 412-2 DP V7
  • Siemens SIMATIC S7-400 CPU 414-2 DP V7
  • Siemens SIMATIC S7-400 CPU 414-3 DP V7
  • Siemens SIMATIC S7-400 CPU 414-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 414F-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 416-2 DP V7
  • Siemens SIMATIC S7-400 CPU 416-3 DP V7
  • Siemens SIMATIC S7-400 CPU 416-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 416F-2 DP V7
  • Siemens SIMATIC S7-400 CPU 416F-3 PN/DP V7
  • Siemens SIMATIC S7-400 CPU 417-4 DP V7
  • Siemens SIMATIC S7-400 CPU 412-2 PN V7
  • Siemens SIMATIC S7-400 H V4.5 and below CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC S7-400 H V6 CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC S7-400 PN/DP V6 and below CPU family (incl. SIPLUS variants)
  • Siemens SIMATIC S7-410 CPU family (incl. SIPLUS variants)
  • Siemens SIPLUS S7-400 CPU 414-3 PN/DP V7
  • Siemens SIPLUS S7-400 CPU 416-3 PN/DP V7
  • Siemens SIPLUS S7-400 CPU 416-3 V7
  • Siemens SIPLUS S7-400 CPU 417-4 V7

Classification

Weakness
  • CWE-347 Improper Verification of Cryptographic Signature

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.